Why Summer Days Grow Long

Written by Studio AM.

Earth's axis is tilted relative to its path around the Sun. As Earth travels through the year, each hemisphere alternately leans toward or away from the Sun. This tilt, not a large seasonal change in Earth-Sun distance, creates the familiar pattern of seasons.

When the Northern Hemisphere leans toward the Sun, the Sun generally follows a longer path above the horizon. Away from the polar regions, days grow longer and the Sun reaches a higher noon position as summer approaches. More hours of sunlight and more direct rays make this northern summer. At the same time, the Southern Hemisphere receives shorter days and less direct sunlight, producing winter there.

About six months later, the pattern reverses. Near the equator, day length changes less through the year. Toward the poles, changes become extreme; within polar circles, the Sun may remain above or below the horizon for whole days around part of the year.

The longest day is called the summer solstice, but it is not usually the hottest day. Land and oceans take time to warm, so average temperatures often peak later. Day length follows geometry immediately, while seasonal heat reflects energy accumulated and released over time.

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    What is the main idea of the passage?

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    Why can hottest temperatures occur after the longest day?

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    What does “hemisphere” mean?

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    What is the longest day called?

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